LF Cast Chassis / Ferrite

Celestion
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CF1840JD

CF1840JD
CF1840JD

  • Balanced airflow venting provides enhanced cooling 
  • Twin demodulation rings
  • Optimised double suspension

Frequency Response and Impedance Curves

Product Graph
  1. Tested for two hours using a continuous, band-limited pink noise signal as per AES standard. Power calculated on minimum impedance. Loudspeaker tested in free air.
  2. Continuous Power Rating is defined as 3dB greater than the AES rating
  3. Measured on axis at 1W, 1m in 2Π anechoic environment.
  4. Xmax derived from: (voice coil winding width-gap depth)/2.
  5. Small signal parameters measured after unit subjected to pre-conditioning signal

General Specifications

Nominal diameter
457mm/18in
Power rating1
1200Wrms
Continuous power rating2
2400W
Nominal impedance
Sensitivity3
95dB
Frequency range
30-2,500Hz
Voice coil diameter
100mm/4in
Chassis type
Cast aluminium
Magnet type
Ferrite
Magnet weight
3.18kg/112oz
Coil material
Round copper
Former material
Glass fibre
Cone material
Kevlar loaded paper
Surround material
Cloth-sealed
Suspension
Double
Xmax4
10mm/0.39in
Gap depth
10mm/0.39in
Voice coil winding width
30mm/1.18in

Small Signal Parameters

D
0.38m/14.96in
Fs
37Hz
Mms
217.4g/7.67oz
Qms
4.372
Qes
0.44
Mmd
185.145g/6.54oz
Qts
0.4
Re
5.29Ω
Vas
155l/5.47ft3
BI
24.76Tm
Cms
0.09mm/N
Rms
11.56kg/s
Le (at 1kHz)
1.16mH

Mounting Information

Overall diameter
460mm/18.11in
Overall depth
220.35mm/8.68in
Cut-out diameter
414mm/16.24in
Mounting slot dimensions
11mm x 7mm/0.43-0.28in
Number of mounting slots
8
Mounting PCD range
432-441mm/17-17.36in
Unit weight
11.6kg/25.5lb

Packed Dimensions & Weight

Single pack size W x D x H
500mm x 500mm x 255mm
/19.7in x 19.7 x 7.11in
Single pack weight
13kg/28.6lb
Multi pack size W x D x H
1210mm x 1050mm x 1070mm
/47.6in x 41.3in x 42.1in
Multi pack weight
305kg/670lb